The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 03, 1998
Filed:
Oct. 17, 1996
James Joseph Downs, Kingsport, TN (US);
Andrew Charles Hiester, Kingsport, TN (US);
Mark Elliott Taylor, Orange, TX (US);
Mark Allan Mueller, Austin, TX (US);
Michael Warren Peters, Gilbert, AZ (US);
William Pleasie Nelson, Nederland, TX (US);
Huntsman Specialty Chemicals Corp., Austin, TX (US);
Abstract
In the continuous purification of a propylene oxide feedstock contaminated with water, methanol and acetone wherein an acetone buffer is established in the column, normal distillation conditions are maintained or restored during or after an upset by continuously monitoring predetermined distillation conditions in the acetone buffer zone, and adding additional acetone to the extractive distillation column when the monitored distillation condition deviates from a predetermined value by a predetermined amount.